Cushion for log-carriages.



No. 745,582. PATENTE!) DEG. l, 17903..

H. G. DITTBENNER.

CUSHION POR LOG GARRIAGES.

APPLIGATION FILED FEB. 21, 1903.

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PATENTE) DEG. 1, '1903.

ANo. 745,582.

H. Gn DTTBENNBR. CUSHION FOR LUG GARRIAGBS.

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No. v'745, 582.

UNITED STATES` Patented December 1, 1903.

PATENT OEEICE.

CUSHION FOR LOG-CARRIAG ES.

SPECIFICATION forming part of Letters Patent No. 745,582, dated December1, 1902?.

I Application tiled February 2 l. 1903. Serial No 144,448. (No model.)

To til whom it 17m/y concern:

Be it known that I, HERMAN G. DITTBEN- NER, a citizen of the UnitedStates, residing at Minneapolis, in the county of Hennepin and State ofMinnesota,have invented certain new and usefullmprovements in Cushionsfor Log- Carriages; and I do hereby declarerthe following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My present invention has for its object to provide an improved cushionespecially adapted for cushioningthe movements of log-car riages; and tosuch ends the invention oonsists of the novel devices and combinationsof devices hereinafter1 described, and defined in the claims. v

The invention is illustrated in the accomA panying drawings,wherein likecharacters indicate like parts throughout the several views.

Figure l is a View in side elevationwith some parts broken away, showingone of my improved cushions applied in position to cushion the movementsof the log-carriage. Fig. 2 is a horizontal section through one of thecushions on the line x2 x2 of Fig. 3. Fig. 3 is a frontend elevation ofthe cushion, and Fig. 4 is a transverse vertical section on the line m4c4 of Fig. 2.

In Fig. ll Vthe numeral l indicates the logcarriage, which moves overrails 2, supported by beamwork 3. The base end of the cushion isanchored by bolts or otherwise to a transverse beam 4, which in turn issecurely anchored to the beamwork 3.

The numeral 5 indicates the cylinder member of the cushion, having atits forward end a detachable head 6 and formed within with alongitudinal leakage passage or groove 7, which groove at its rear endterminates forward of the rear head or end of said cylinder. The numeral8 indicates the piston member of the cushion, the stem of which iscylindrical and works through a large bearing-hub of the cylinder-head6. A large sleeve 9 is rigidly secured at its rear end to the inner orrear head of the cylinder 5, and at its for-` coiled retracting-spring10 is placed within the sleeve 9 and cylindrical stem or piston 8 andnormally holds the piston with its stem projecting to its limit, asshown in Fig. 2. The spring l0 reacts against the outer end of thepistoustem and against a plug 1l, which, as shown, is secured Within therear end of the sleeve 9 and is engaged by a screw-bolt l2, passedthrough the rear head of the cylinder. The screw l2rserves to rigidlysecure the sleeve 9 in working posit-ion, with its axis concentric tothe axis of said cylinder and to the axis of said piston. It isimportant to note that the groove 7 is formed in the bottom of thecylinder, so that oil introduced into the cylinder Will run down andlodge in the same. In the upper portion of the cylinder is an oil-holethat is normally closed by a plug 13. Asis obvious, oil may be readilyintroduced in the cylinder When the plug 13 is removed. When theprojecting end of the piston is struck by the log-carriage, the pistonwill of course be forced rearward against the pressure ofthe air whichis caged in the cylinder back of the piston and finds but acomparatively` slow escape to the front of, the piston through theleakage-groove 7. This rearward movement of the piston is furtherresisted to some extent both by the retractingspring l0 and'by the airwhich is compressed Within the sleeve 9 and the stem of the piston; butthese actions of the said spring and theair caged and compressed Withinthe said sleeve and piston-stem are subordinate to more importantfunctions, presently tobe described. When the head of the piston passesforce the piston forward or backward to nor-v mal position, and theretracting-spring 10 assists in this action. Were it not for theleakage-groove 7, the piston would be given its IOC return or forwardmovement with a quick jump or rebound; but the leakage-groove under therearward movement of the piston allows air to escape in front of thepistonhead, and this air must work its way back to the rear'portion ofthe cylinder before the piston can be restored to normal position. Inthis way a reaction-cushion is afforded which. retards the movement ofthe piston back to its normal position.

In practice I have found that even without the retracting-spring aircompressed in the sleeve 9 and stem of the piston will cause the returnof the piston nearly, but usually not quite, to normal position. Theretractingspring is therefore an auxiliary device for insuring thereturn of the piston to normal position.

As already stated, the leakage-groove 7 will become filled withlubricating-oil. When the piston is moved, and especially when it issuddenly moved, rearward, the air forced to escape through theleakage-groove willblow.

the oil from between the same and the piston-head in a spray, and theoil thus sprayed or atomized will serve to thoroughly lubricate all ofthe frictionally-engaging parts of the device. This action in practiceis very important. Obviously to accomplish this second function of thegroove 7 the said groove must be placed in the lower portion of thecylinder.

The device described is of course capable of modification within thescope of my invention as herein set forth and claimed. The efficiency ofthe device described has been thoroughly demonstrated in actualpractice.

What I claim, and desire to secure by Letters Patent of the United lows:

l. The combination with a cylinder having an internaLsleeve, of a pistonhaving a hollow stem telescoping with said sleeve and cooperatingtherewith to afford a secondary compression-chamber, substantially asdescribed.

2. The combination with a cylinder having an internal sleeve, of apiston having a hollow stem telescoping with said sleeve, and a springplaced within said sleeve and the stern of said piston, substantially asdescribed.

3. The combination with a cylinder having an internal sleeve and aninternal leakagegroove, of a cooperating piston having a hollow stemthat telescopes with said sleeve, substantially as described.

4r. A cushion comprising a cylinder having a groove in its lowerportion, a plugged oilhole in said cylinder permitting of theintroduction of oil, and a piston working in said cylinder andcooperating with said groove to cause air to blow oil into a spray. l

5. In a cushion, the combination with the cylinder 5 having the groove 7and axial sleeve 9, of a cooperating piston 8 working within saidcylinder and having a hollow stem telescoping-over said sleeve, and thespring 10 compressed within said sleeve and the hollow stem of saidpiston, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HERMAN G. DITTBENNER.

Witnesses:

ELIZABETH H. KELEHER, F. D. MERCHANT.

States, is as fol-

